From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from the Royal Aircraft Establishment regarding crankshaft torsional vibrations and the stiffness of a new 20 HP shaft.
| Identifier | ExFiles\Box 25\3\ Scan341 | |
| Date | 30th April 1928 | |
| G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 16/859. X634 When Telephoning with regard to this letter please ask for Extension Number...........20... TELEGRAMS: Ballooning, South Farnborough. TELEPHONE: 108 North Camp, 361 Aldershot, & 103 Farnborough. All Stores to be addressed :— R.A.E. Siding, Farnborough Station, Southern Railway (L. & S. W. Section). All communications to be addressed to The Superintendent. REFERENCE: 70/D/6f/30. Your ref:- Hs{Lord Ernest Hives - Chair}/Tsnl/Lg. ROYAL AIRCRAFT ESTABLISHMENT, SOUTH FARNBOROUGH, HANTS. 30 April 27th.1928. Messrs.Rolls Royce Ltd., Derby. Dear Sirs, Crankshaft Torsional Vibrations. We are much obliged to you for the information given in your communication of the 23rd.instant, addressed to Major Carter. The increase of stiffness obtained with the new 20 H.P. shaft by increasing the journal diameter slightly and adopting oval webs is of considerable interest to us as we were anxious to have a definite check on the effectiveness of web thickness indicated by the formula - and your comparative tests provide this. With reference to item (3) of your letter, we will send you a copy of the curve you require within a few days. We return herewith the table with the frequency values filled in. Yours faithfully, (Signature: H Wimperis) for Chief Superintendent, R.A.E. ea. Encl. Table. | ||